Coating processes – Solid particles or fibers applied
Patent
1990-10-25
1992-08-11
Beck, Shrive
Coating processes
Solid particles or fibers applied
427215, 427384, 4273977, 106405, 106705, 264117, 264DIG49, 428403, B05D 724, B29C 6724, B32B 904
Patent
active
051377535
ABSTRACT:
Ash from a fluidized bed combustor in which limestone particles are suspended in the presence of carbonaceous fuel being burned is pelletized. Lime-containing bed ash ("FBCR") is produced in the combustor, and fly ash ("FBC fly ash") is generated as a by-product of the combustion process. FBCR and FBC fly ash generated during the combustion process are obtained. Water is added to the FBCR so as to convert a substantial portion of the lime to hydrated lime. Water is added to the FBC fly ash and pellets are formed from the FBC fly ash. The FBC fly ash pellets are coated with the hydrated FBCR. The coated FBC fly ash pellets are cured in a curing silo for a minimum of 6-10 hours, preferably by nesting them in a bed of hydrated FBCR. The cured pellets then are separated from the bed of hydrated FBCR. New pellets are formed by mixing the separated, hydrated FBCR with FBC fly ash and water. The pellets formed with the separated, hydrated FBCR contain about 0-80% by weight of FBCR and about 100-20% by weight of FBC fly ash. Agglomeration of the pellets in the curing silo is prevented by coating the pellets with hydrated FBCR. Agglomeration also can be prevented by spraying newly formed pellets with certain chemicals, by drying their surfaces, or by coating the pellets with inert materials other than hydrated FBCR.
REFERENCES:
patent: 833005 (1906-10-01), Schulte-Steinberg
patent: 859411 (1907-07-01), Schumacher
patent: 3490895 (1970-01-01), Svensson
patent: 3852084 (1974-12-01), Webster et al.
patent: 4313762 (1982-02-01), Pound
patent: 4344796 (1982-08-01), Minnick
patent: 4354876 (1982-10-01), Webster
patent: 4394176 (1983-07-01), Loggers
patent: 4397742 (1983-08-01), Minnick
patent: 4397801 (1983-08-01), Minnick
patent: 4419312 (1983-12-01), Loggers et al.
patent: 4472198 (1984-09-01), Nowicki et al.
patent: 4490178 (1984-12-01), Loggers et al.
patent: 4514307 (1985-04-01), Chestnut et al.
patent: 4618376 (1986-10-01), Saternus et al.
patent: 4629509 (1986-12-01), O'Hara et al.
patent: 4731120 (1988-03-01), Tutti
patent: 4744829 (1988-05-01), Eirich et al.
patent: 4764216 (1988-08-01), Hooykaas
patent: 4770709 (1988-09-01), Loggers
patent: 4770831 (1988-09-01), Walker
patent: 4780144 (1988-10-01), Loggers
patent: 4877453 (1989-10-01), Loggers
patent: 4880582 (1989-11-01), Spanjer et al.
patent: 4940611 (1990-07-01), Brunet et al.
patent: 4941772 (1990-07-01), Roesky et al.
patent: 5002611 (1991-04-01), Rademaker
patent: 5008055 (1991-04-01), Holley
Contract Report: Production of Concrete Using Fluidized Bed Combustion Waste and Power Plant Fly Ash, Sep., 1986, Rose, Bland, & Jones.
Agglomeration of Steel Plant Waste for Recycling, Sep., 1985 Holley.
Bland Alan E.
Cox Richard K.
Lichty E. Ray
Rowen Allen R.
Schumann Richard A.
Beck Shrive
Owens Terry J.
LandOfFree
Pelletizing ash does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pelletizing ash, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pelletizing ash will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-345382